PI06958: Unexpected servant data in the BBOO0327I message and possible servant termination after a WLM queue percent timer expires

Fixes are available

APAR status

Closed as program error.

Error description

A server that processes MDB Plan "A" workload is configured&#65524;
with the following settings:
    control_region_mdb_queue_timeout_percent: 10.
    control_region_mdb_request_timeout: 55.
.
During a period of heavy inbound MDB work, the server starts to
get behind and several MDB requests reach the MDB Queue Timeout
Percent age of 5.5 seconds. , BBOO00327I messages are issued
for these MDBs as part of timeout processing. One of these
requests was allowed to stay on the work queue for 1.0 seconds
longer than it should - and it was even permitted to be
dispatched into a servant region. However, this MDB was timed
out almost immediately after being dispatched.
*
13:40:37.96
 BBOO0327I MDB Plan "A" REQUEST TIMEOUT:
          (0078):(FFFFF951):(0002000D):(009C75E0):(STC00117):
          (2013/11/12 13:40:31.484940):
          (2013/11/12 13:40:31.486188):
          (2013/11/12 13:40:37.958513):
          (mdbclass):(mdbrequest):(Local to this Server):
          ():():(InternalRequestQueue_B01Lp)
        .
13:40:38.06
 BBOO0232W A request for Class Name 'mdbclass' and Method Name
          'mdbrequest', from Local to this Server, has timed
          out.  The servant process associated with the request
          will be terminated. Request Id(FFFFF951)

Local fix

Problem summary

****************************************************************
* USERS AFFECTED:  All users of IBM WebSphere Application      *
*                  Server V7.0, V8.0, and V8.5                 *
****************************************************************
* PROBLEM DESCRIPTION: WebSphere Application Server for z/OS   *
*                      Servant process is terminated after a   *
*                      WLM Queue percent timer expired.        *
****************************************************************
* RECOMMENDATION:                                              *
****************************************************************
A WLM queue percent timer recovers a request which exceeds a
specified time spent on the WLM queue prior to being selected
for execution by a Servant.
A small window exists where a request is considered still
on the WLM queue and has triggered the WLM Queue percent
cleanup, but the request is allowed to progress to its next
state.  This progression in request state may cause a common
cleanup routine to decide to terminate the associated Servant
for the request.
The result is that a request which would have been allowed
to run its full dispatch timeout value was only given its WLM
queue percent value before the Servant was terminated with a
ABENDEC3/ABENDSEC3 REASON 04130004, 04130007, 04130008, or
0413000A.
.
An alternative scenario is that the Servant is not terminated
. but the timeout message BBOO00327I contains Servant
. information (e.g. ASID(xxxx)) even though the request was
. cleaned up prior to dispatch.

Problem conclusion

Code has been modified in the request timeout processing
routines dealing with WLM queue percent to eliminate the
ability of the request state to progress once the WLM queue
percent timeout processing has determined that the request needs
to be recovered.

APAR PI06958 is currently targeted for inclusion in WebSphere
Application Server Fix Packs 7.0.0.33, 8.0.0.9, and 8.5.5.2
of WebSphere Application Server.

Please refer to URL:
//www.ibm.com/support/docview.wss?rs=404&uid=swg27006970
for Fix Pack availability.

Temporary fix

Comments

APAR Information

APAR number
PI06958
Reported component name
WEBSPHERE FOR Z
Reported component ID
5655I3500
Reported release
700
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Special Attention
NoSpecatt
Submitted date
2013-11-26
Closed date
2013-12-20
Last modified date
2014-07-01

APAR is sysrouted FROM one or more of the following:
APAR is sysrouted TO one or more of the following:

Fix information

Fixed component name
WEBSPHERE FOR Z
Fixed component ID
5655I3500

Applicable component levels

R700 PSY UI18561
UP14/06/21 P F406

Fix is available

Select the PTF appropriate for your component level. You will be required to sign in. Distribution on physical media is not available in all countries.

[{"Business Unit":{"code":"BU059","label":"IBM Software w\/o TPS"},"Product":{"code":"SS7K4U","label":"WebSphere Application Server for z\/OS"},"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"7.0","Line of Business":{"code":"LOB45","label":"Automation"}}]

Document Information

Modified date:
28 April 2022

Tips

PI06958: Unexpected servant data in the BBOO0327I message and possible servant termination after a WLM queue percent timer expires

Fixes are available

Subscribe

APAR status

Closed as program error.

Error description

Local fix

Problem summary

Problem conclusion

Temporary fix

Comments

APAR Information

APAR number

Reported component name

Reported component ID

Reported release

Status

PE

HIPER

Special Attention

Submitted date

Closed date

Last modified date

APAR is sysrouted FROM one or more of the following:

APAR is sysrouted TO one or more of the following:

Fix information

Fixed component name

Fixed component ID

Applicable component levels

R700 PSY UI18561

Fix is available

Select the PTF appropriate for your component level. You will be required to sign in. Distribution on physical media is not available in all countries.

Document Information

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